The six performed the group’s hit “Worth It” with all the girls wearing shimmery, blue two-piece numbers designed by Marina Toybina (which Swift said was loaned to her by one of the members).

Taylor Swift and Fifth Harmony

Before they launched into the high-energy performance, Swift praised the group’s command of fans at the packed Levi’s Stadium to “scream louder for them than you’ve screamed for me the entire night.”

“They have one of the most powerful and loyal fan bases in the world,” she said. “They also have one of the biggest smash hit singles in the country right now called ‘Worth It.’ ”

The “Bad Blood” singer looked like she belonged with the group as she joined in on the choreography and delivered some of the lyrics. Which is expected as she’s had a lot of practice. Her 1989 tour has seen multiple guests including Andy Grammer, Nick Jonas, Empire’s Serayah and more – many, many more.